Alert archive / New Jersey / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 204, NWS Philadelphia/Mount Holly

July 29, 2011Sussex County, New Jersey

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 29, 2011, 5:59 PM EDT for Sussex County, New Jersey. It was in force for 61 min. 1 report came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Jul 29, 2011, 5:59 PM EDT (21:59 UTC)
Expired: Jul 29, 2011, 7:00 PM EDT
In force: 61 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon

County Sussex County, NJ

The radar

The Philadelphia radar (KDIX), 141 km from the middle of the area, began a volume at 22:01 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

What was reported inside it

Time	Report	Where	Remark
Jul 29, 6:30 PM EDT	TSTM WND DMG	Vernon Twp, NJ	TREES DOWN.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Jul 29, 2:40 PM EDT	Severe Thunderstorm Watch	SPC	8 hr
Jul 29, 5:03 PM EDT	Tornado Watch	SPC	3 hr

The nearest sounding before it

Brookhaven, NY (KOKX), launched 12:00Z, 10.0 hours before the alert went out and 145 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 81 J/kg
Mixed-layer CIN: -109 J/kg
Mixed-layer LCL: 569 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: 8 m²/s²
0-3 km storm-relative helicity: 19 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

682 
WUUS51 KPHI 292159
SVRPHI
NJC037-292300-
/O.NEW.KPHI.SV.W.0204.110729T2159Z-110729T2300Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
559 PM EDT FRI JUL 29 2011

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHEASTERN SUSSEX COUNTY IN NORTHWEST NEW JERSEY...

* UNTIL 700 PM EDT

* AT 555 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND
  DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED NEAR
  HIGH POINT...OR 7 MILES EAST OF MONTAGUE...AND MOVING SOUTHEAST AT
  30 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  SUSSEX...VERNON VALLEY...HAMBURG...FRANKLIN AND HIGHLAND LAKE

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IF YOU ARE IN ITS PATH OF THIS STORM...PREPARE IMMEDIATELY FOR DAMAGING 
WINDS...DESTRUCTIVE HAIL...AND DEADLY CLOUD TO GROUND LIGHTNING. 
PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER...PREFERABLY INSIDE A STRONG 
BUILDING BUT AWAY FROM WINDOWS.

PLEASE REPORT HAIL OR STRONG WINDS TO THE NATIONAL WEATHER SERVICE BY
CALLING TOLL FREE...1-877-633-6772...WHEN YOU CAN DO SO SAFELY.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 1100 PM EDT FRIDAY EVENING
FOR NORTHWEST NEW JERSEY AND NORTHEAST PENNSYLVANIA. A SEVERE
THUNDERSTORM WATCH ALSO REMAINS IN EFFECT UNTIL 1100 PM EDT FRIDAY
EVENING FOR NEW JERSEY AND EASTERN PENNSYLVANIA.

&&

LAT...LON 4121 7439 4120 7437 4118 7437 4107 7450
      4106 7453 4124 7483 4135 7472 4135 7468
TIME...MOT...LOC 2158Z 310DEG 24KT 4128 7465

$$

JJM

1 follow-up statement

076 
WWUS51 KPHI 292233
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
633 PM EDT FRI JUL 29 2011

NJC037-292300-
/O.CON.KPHI.SV.W.0204.000000T0000Z-110729T2300Z/
SUSSEX NJ-
633 PM EDT FRI JUL 29 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 700 PM EDT
FOR EAST CENTRAL SUSSEX COUNTY...

AT 630 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE
HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS
LOCATED NEAR HIGHLAND LAKE...OR 18 MILES NORTHEAST OF NEWTON...MOVING
SOUTHEAST AT 35 MPH.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

PLEASE REPORT HAIL OR STRONG WINDS TO THE NATIONAL WEATHER SERVICE BY
CALLING TOLL FREE...1-877-633-6772...WHEN YOU CAN DO SO SAFELY.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 1100 PM EDT FRIDAY EVENING
FOR NORTHWEST NEW JERSEY AND NORTHEAST PENNSYLVANIA. A SEVERE
THUNDERSTORM WATCH ALSO REMAINS IN EFFECT UNTIL 1100 PM EDT FRIDAY
EVENING FOR NEW JERSEY AND EASTERN PENNSYLVANIA.

&&

LAT...LON 4120 7465 4128 7454 4120 7437 4118 7437
      4109 7448
TIME...MOT...LOC 2233Z 308DEG 38KT 4115 7441

$$

JJM

The office that day

Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 29, 2:42 AM EDT	Special Weather Statement	PHI	Atlantic, Burlington, Camden, Cumberland, Middlesex, Monmouth and 1 more	63 min
Jul 29, 3:45 AM EDT	Special Weather Statement	PHI	Atlantic, Burlington, Camden, Cumberland, Ocean	60 min
Jul 29, 5:12 PM EDT	Special Weather Statement	PHI	Hunterdon, Morris, Somerset, Sussex, Warren	108 min
Jul 29, 6:17 PM EDT	Special Weather Statement	PHI	Monmouth	58 min
Jul 29, 6:23 PM EDT	Special Marine Warning	PHI		97 min
Jul 29, 6:24 PM EDT	Severe Thunderstorm Warning	PHI	Monmouth, Ocean	66 min
Jul 29, 6:25 PM EDT	Severe Thunderstorm Warning	PHI	Middlesex	20 min
Jul 29, 7:03 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Mercer, Middlesex, Monmouth, Ocean	46 min
Jul 29, 7:14 PM EDT	Severe Thunderstorm Warning	PHI	Burlington	42 min
Jul 29, 7:27 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Monmouth, Ocean	63 min
Jul 29, 7:40 PM EDT	Special Marine Warning	PHI		95 min

Nearby

Severe Thunderstorm Warnings in New Jersey, 2011 Every severe thunderstorm warning in 2011

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.